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INVESTMENTS - Schedule of Roll Forward of Allowance for Credit Losses of Fixed Maturities, Held to Maturity (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward]    
Beginning balance $ (8) $ (9)
Credit losses on securities where credit losses were not previously recorded (1) 0
Increases in allowance on previously impaired securities 0 0
Decreases in allowance on previously impaired securities 0 0
Reduction in allowance due to disposals 0 0
Balance, end of period (9) (9)
Corporate Securities    
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward]    
Beginning balance (2) (2)
Credit losses on securities where credit losses were not previously recorded 0 0
Increases in allowance on previously impaired securities 0 0
Decreases in allowance on previously impaired securities 0 0
Reduction in allowance due to disposals 0 0
Balance, end of period (2) (2)
Asset-backed Securities    
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward]    
Beginning balance (5) (6)
Credit losses on securities where credit losses were not previously recorded 0 0
Increases in allowance on previously impaired securities 0 0
Decreases in allowance on previously impaired securities 0 0
Reduction in allowance due to disposals 0 0
Balance, end of period (5) (6)
Foreign corporate securities    
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward]    
Beginning balance (1) (1)
Credit losses on securities where credit losses were not previously recorded (1) 0
Increases in allowance on previously impaired securities 0 0
Decreases in allowance on previously impaired securities 0 0
Reduction in allowance due to disposals 0 0
Balance, end of period $ (1) $ (1)